Improved reameb and tap



uiten. tairestrut ffice.

'SAMUEL GLASSON, 0F NEW YORK, N. Y.

Lettera Pate-nt No. '82,618, dated September 29, 1868-.

IMPROVED BEAMER AIN D TAP.

TO ALL WHOlQI 1T MAYYCONCERN:l

Be it known that I, SAVMUEL GLAsSoN, of the city, county, and State ot'V New York, have inventeda new and useful Improvement in Expanding-Beamers and Taps and 1 do' hereby declare that the following isa full, clear, and exact description of the same, reference being had .to the-accompanying drawings, forming a part of .this spenication, in whichv j Figure 1 vrepresents alongitudinal section oi n rcameror tap constructed according to my improvement, and' Figure. 2 a cross-'section of the same. 4 Similar letters of reference indicate corresponding -parts in both figures. i .This invention consists in the construction oia reamer or tap with a hollow cylindrical stock,carrying within its central cavity a plug, which is operated by afscrew, and Vwhich is-provided with inclined grooves, in

which are received'the backs of cutters projecting from slots in the stock, the said cutters being adjustable by the longitudinal movement of the central plug, produced by the turning of the'screw, aided by springs arranged within the stock., i u

In order that others may be better 'enabled to understand the Aconstruction and operation of my invention, I will proceed izo-describe it with reference to the dpawings. I l. v

A is the stock of the reamer ortap, cfa cylindrical form, pmvided in its sides with longitudinal slot-s, which communicate with a central bore, a, extending lengthwise of'the stock, nearly the entire length thereof. Within these slots ar'e fitted cutters B, which are provided with springs s s s's,lse'enred in the ends thereof, and so acting against the inner surface of the stock as to retain the said cutters within their slots.

Within the central cavity of the stock is tted'to slidea plug, C,Voi` cylindrical form,'but havinglongtudinal tapering or inclined grooves c cut upon it, said grooves taperinginwardly, or sinking deeper into the plug at the inner thanl at the outer extremity. Fitted within the outer end of 'this plug C, is a screw, e, which passes through 'and hasv its bearing wit-hinv a blo'ck, E, secured within the open'end of the stock A, audits outer end. terminating in a square headfwhereby the .stock is turned. .This screw-c, passing through the said 'blocl' E, terminates in square headf, beyond the outer end of the bearing-block E.' That part of'th'e screw e, within thesnid bearing-block E, is not threaded', ybut plain, so as tovnllow the said screw-a rotating, without a longitu:

dinal motion therein; vforward and backward motion being prevented by shouldersj" and g upon the said screw e, at each end of the block E. The said bearing-block E is prevented from turning in the stock A by a setscrcw, h, passing through the thickness or shell of thestock, and entering the said block E a suilicient depth to effect the purpose for which it is designed, or the 'entrance ci' the central opening a may be tapped, and a thread cut upon the inner endof the block E, and thereby establish the desired connection. f

Byv turning the screw e backwards, the plug is forced deeper into thegcavitycf the stock., exerting n wedge-like action against the cutters, -by means of the tapering'grooves acting against the backs thereof, which are also`provided with an inclined or tapering form, to fit the tapering inclination of the said grooves, thereby causing a'yielding of the springs e, and projection otf'thecutters beyond the periphery of the stock A.' VBy turning thesaid screw forward, the plug C-is drawn backward, relieving the pressure of the grooves against the cutters, which are simultaneously drawn inward by the springs e. l By providing the edge of theeutters with suitable teeth or corrugations, this invention is made' applicable to taps for cutting threads, and for various other purposes.

What'lf claim as `my invention, and desire to' have secured byLetters Patent, is-

The arrangement, herein described and shown, of the tubular stock A, grooved plug C, cutters B, springs s, and swivelled screw E e, for the purpose set forth.

i SAMUEL GLASSON.

Witnesses:

A. LE CLERC, A. KINNIER. 

